Best to put it on a piece of rock rubble, a plug, a shell, or some reefers use tile (though I'd be careful to ensure you're not adding heavy metals with the tile route). If you set it on the glass bottom it will attach to it. Ideally your qt lighting should be as close to your dt lighting in par value as possible though there is no need to spend extra money to have fancy controls or rich color. The animals won't be in there long enough for those issues to really matter. In choosing a light focus on quality of light output vs color and features. I'd also look to find a dimmable fixture so you can accomplish your light acclimation in qt and avoid shocking your critters
